EP 1205512 B1 20051012 - Process for producing porous polymide
Title (en)
Process for producing porous polymide
Title (de)
Verfahren zur Herstellung von porösem Polymid
Title (fr)
Procédé de préparation de polyimide poreux
Publication
Application
Priority
JP 2000345617 A 20001113
Abstract (en)
[origin: US6372808B1] A porous polyimide having a finely cellular structure and having a low dielectric constant and heat resistance. The porous polyimide can be produced by a process comprising adding a dispersible compound to a polyimide precursor to form a micro-domain structure in which the dispersible compound is dispersed in the polymer so as to have a size smaller than 10 mum and then removing the dispersible compound by extraction with supercritical carbon dioxide to thereby make the precursor porous, wherein the interaction parameter χAB between the polyimide precursor A and the dispersible compound B is larger than 3. This porous polyimide has an average cell diameter smaller than 5 mum and a dielectric constant of 3 or lower.
IPC 1-7
IPC 8 full level
C08J 9/26 (2006.01); C08G 73/10 (2006.01); C08J 9/28 (2006.01); H05K 1/03 (2006.01)
CPC (source: EP KR US)
C08G 73/10 (2013.01 - KR); C08J 9/28 (2013.01 - EP US); H05K 1/0346 (2013.01 - EP US); C08J 2201/0464 (2013.01 - EP US); C08J 2379/08 (2013.01 - EP US); Y02P 20/54 (2015.11 - EP US)
Designated contracting state (EPC)
DE FR GB IT
DOCDB simple family (publication)
US 2002058720 A1 20020516; US 6372808 B1 20020416; DE 60113943 D1 20051117; DE 60113943 T2 20060511; EP 1205512 A1 20020515; EP 1205512 B1 20051012; JP 2002146085 A 20020522; JP 4557409 B2 20101006; KR 100782653 B1 20071207; KR 20020037286 A 20020518; TW I285654 B 20070821
DOCDB simple family (application)
US 98441601 A 20011030; DE 60113943 T 20011108; EP 01126716 A 20011108; JP 2000345617 A 20001113; KR 20010070182 A 20011112; TW 90127401 A 20011105